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Old 11-08-2019, 06:09 AM
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rss Androgen Receptor Is a Non-canonical Inhibitor of Wild-Type and Mutant Estrogen Recep

Androgen Receptor Is a Non-canonical Inhibitor of Wild-Type and Mutant Estrogen Receptors in Hormone Receptor-Positive Breast Cancers.

iScience. 2019 Oct 23;21:341-358

Authors: Ponnusamy S, Asemota S, Schwartzberg LS, Guestini F, McNamara KM, Pierobon M, Font-Tello A, Qiu X, Xie Y, Rao PK, Thiyagarajan T, Grimes B, Johnson DL, Fleming MD, Pritchard FE, Berry MP, Oswaks R, Fine RE, Brown M, Sasano H, Petricoin EF, Long HW, Narayanan R

Abstract
Sustained treatment of estrogen receptor (ER)-positive breast cancer with ER-targeting drugs results in ER mutations and refractory unresponsive cancers. Androgen receptor (AR), which is expressed in 80%-95% of ER-positive breast cancers, could serve as an alternate therapeutic target. Although AR agonists were used in the past to treat breast cancer, their use is currently infrequent due to virilizing side effects. Discovery of tissue-selective AR modulators (SARMs) has renewed interest in using AR agonists to treat breast cancer. Using translational models, we show that AR agonist and SARM, but not antagonist, inhibit the proliferation and growth of ER-positive breast cancer cells, patient-derived tissues, and patient-derived xenografts (PDX). Ligand-activated AR inhibits wild-type and mutant ER activity by reprogramming the ER and FOXA1 cistrome and rendering tumor growth inhibition. These findings suggest that ligand-activated AR may function as a non-canonical inhibitor of ER and that AR agonists may offer a safe and effective treatment for ER-positive breast cancer.


PMID: 31698248 [PubMed - as supplied by publisher]



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Old 11-16-2019, 08:54 AM
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I do not understand any of this. I am sure it is worth a read just to learn something.
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